it's already at the freezing mark in a number of places around the bay area right now. colder temperatures overnight, dipping into the 20s in santa rosa, napa, 27 in fairfield, 30 in pleasanton, same thing in vallejo. a very cold night indeed. but we are going to start to see changes through the yes or no hours into tomorrow especially. a little cloud cover approaching the north bay, lots of it to the north as we look eight storm that's sitting off to the north. this is going to move slowly. throughout the day tomorrow, increasing clouds, then through the evening, rain will start in the north bay. the 3:00 hour, you see the clouds increasing over the north bay tomorrow, and at 8:00, the rain starts. midnight it's going to be concentrated mainly to the north. as we head into the overnight hour, it'll stay mainly to the north.